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Hi everyone,
This is just another piece of something that I cannot identify, found at Yaxley, Cambridgeshire, UK, three days ago.
My first guess is a cropolite fossil but I'm more convinced that this is just a piece of random rock.
Yaxely Lake is very rich in Jurassic fossils buried in the Oxford Clay found there. I managed to find a lot of belemnites and ammonites but this isn't one of them.
Any help you could offer would be greatly appreciated.
Thanks,
Bong

Hi everyone,
Attached are pictures of three small fragments of belemnites I found three days ago in Yaxley, Cambridgeshire, UK. In the first picture, two of the belemnites are what I usually find in the lake but one of them looks significantly different. It looks like it is coated in thick white stuff (which I cant identify) which almost makes me believe this may not even be a belemnite fossil. Can anybody tell me what this is please? Is this even belemnite?
Thanks,
Bong

Hi everyone,
Two days ago, I went to Yaxley lake in Cambridgeshire (UK) and I found a handful of ammonites and belemnites. However, buried in the Oxford Clay with those ammonites and belemnites, I found this odd looking pebble which I was not able to identify (I am only able to tell obvious ones like ammonites, belemnites, bivalve, gastropod etc...). Before I decide to throw this away, I just wanted to ask you all whether this is something worth keeping for or just another random pebble. Any help you could offer would be greatly appreciated. I can upload more pictures if you need so please let me know.
Cheers,
Bong

This is a brief video showing inclusion contained with in a Jurassic marine coprolite thanks to the magic of X-ray computed tomography (aka Micro CT Scan). The coprolite is from the Oxford Clay Formation, Orton Pit, Peterborough, Cambridgeshire, England. Imagery was provided by the University of Minnesota X-ray Computed Tomography Lab.

This coprolite is from a marine creature that swam in the Jurassic seas that once covered this parts of England. The dark inclusions that can be seen on the surface are cephalopod hooks. In April 2016, the University of Minnesota X-ray Computed Tomography Lab scanned the specimen using a X5000 high resolution microCT system with a twin head 225 kV x-ray source and a Dexela area detector (3073 x 3889 pixels). Many of the images shown here are of individual 3D elements/features within the coprolite that were separated/isolated using Blob3D.
The taxonomic classification given is for the inclusions, not the coprolite.
Aside from the hooks, it is hard to definitively identify the inclusions without damage to the coprolite. The following is a list of inclusions:
241 hooks of various sizes that are at least 75% intact.
200+ plate-like fragments of various sizes.
19 ellipsoidal structures, possibly forams or parasite eggs.
2 unidentified long, straight conical structures joined at wide end (A)
1 long rod-like structure with a bulbous end (B)
1 unidentified mass that looks like it was the attachment point for 5 rod-like structures (C)
1 1ong cylindrical (rod) structure that tapers in the center. The center density is much lower than the outer shell (D)
1 irregular structure that looks I originally thought might be an ink sack or buccal mass, but the size is wrong. Experta think it is more likely foraminifera (E)
1 irregular structure, possibly a statolith (F)
Acknowledgements: Thank you to Neale Monks and Christian Klug for providing input.